Dental-instrument holder.



PATENTBD FEB. 13, 1906.

J. W. IVORY. DENTAL INSTRUMENT HOLDER.

APPLICATION FILED SEPT 27 1905.

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UNITED STATES PATENT OFFICE.

DENTAL-INSTRUMENT HOLDER.

v Specification of Letters Patent.

Patented Feb. 13, 1906.

Application filed September 2'7, 1905. Serial No. 280,333.

To CLZZ whom it may concern:

Be it known that I, JAMES W. IVORY, a subject of the King of Great Britain, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Dental-Instrument Holders, of which the following is a specification.

My invention consists of a device for holding a dentalinstrument, the same embodying a pair of jaws and novel means for closing and opening the same. It also embodies novel means on the jaws for preventing lateral motion of the instrument or implement applied thereto.

Figure 1 represents a side elevation of a dental-instrument holder embodying my invention. Fig. 2 represents a longitudinal section thereof. Fig. 3 represents a side elevation of a portion at a right angle to Fig. 1. 1

Figs. 4, 5, 6, and 7 represent detail views. Fig. 8 represents a side elevation of a portion showing aws of different lengths from those in the other figures.

Similar letters of reference indicate correspon ding parts in the figures.

Referring tp the drawings, A designates the handle of the instrument, and B designates a shaft which is fitted within the bore of said handle and has secured to its outer or lower end the milled head C, which is adapted to be rotated at the adjacent end of the handle A. The inner end of said shaft has secured to it the shoulder D, which bears freely upon the neck E, the latter being connected with the adjacent end of the handle A, it being noticed that by the above construction the shaft B is swiveled in said handle. The neck E is exteriorly screw-threaded, and the shoulder and the adjacent portion of the shaft B have a bore F therein, the wall of the same being screw-threaded.

G designates a sleeve whose inner terminal H is adapted to be screwed upon the neck E, thus attaching the same to the handle A, said terminal also freely inclosing the shoulder D, as most plainly shown in Fig. 2. On the outer terminal of the sleeve G is the angularlyextending jaw J, which is fixed thereto. K designates a jaw opposite to said jaw J, the

same extending angularly from and being carried by the shank L, which enters said sleeve G and has a threaded end L, which enters the bore F and engages with the threads of the wall thereof, a portion of said end being broken away in Fig. 6, it now being seen that by rotating the swiveled shaft B, and consequently the shoulder D, as the threads 'of the bore F engage with the threads of said end L of the shank L said shank may be moved in opposite directions, by which a holding the implement or instrument between them.

In order to prevent rotation of the shank L in the sleeve G, one portion of the opening or bore. of the latter is made halfround, and. the other portion is right-lined, thus making said opening of variable contour, as shown in Fig. 4, and said shank is similarly shaped, the effect of which is evident.

In order to prevent rotation or lateral movement, or both, of the implement or instrument when inserted between the jaws, the back of the jaw K at its place of junction with the shank L has thereon an eye M, the wall of which is partly circular and partly right-lined or flattened, said eye or opening M passing entirely through said shank and having at what maybe termed its upper wall form a continuity of back of the face of said jaw K, so that when an implement or instrument is inserted in said eye it will engage said right-lined portion, and thus be incapable of rotation or lateral movement, while otherwise being clamped by the jaws, said implement or instrument thus being doubly held.

On theinner faces of the jaws J K there are longitudinally-extending recesses N, whose walls present edges which bite the implement or instrument inserted between the jaws, and so center the latter, retaining it true in position. Said faces are also serrated, as at P, whereby they take firmer hold of said implement or instrument and prevent possible slipping thereon.

In Fig. 8 the jaws are shown as shorter than those in Figs. 1 and 2.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is I 1. In an instrument-holder of the character stated, a handle, a stationary jaw thereon,

' dle on which said shoulder is svviveled.

2. In an instrument-holder of the character stated, a handle, a rotary shaft which is mounted in said handle, a sleeve, a neck connecting said sleeve with said handle, a jaw on said sleeve, a movable shank in said sleeve having a threaded connection with said shaft,

v a jaw on said shank opposite to that on said sleeve and ashoulder on said shaft, said shoulder having a bearing on said neck.

3. In a holder of the character stated, a jaw adapted to clamp an implement or instrument, a shank carrying said jaw and an eye on said shank, said eye extending entirely through said shank to receive said implement or instrument and having a wall forming a continuity of the back of said jaw.

4. In an instrument-holder of the character stated, a jaw provided with an opening which is partly right-lined and partly round to interlock the implement or instrument applied to said jaw and prevent lateral movement thereof.

5. In an implement or instrument holder of the character stated, a jaw, a shank carrying the same, a longitudinally-extending recess in the face of said jaw and an eye on said shank back of said recess.

6. In an implement or instrument holder of the character stated, a jaw, a shank carrying the same, a longitudinally-extending recess in the face of said jaw, an eye on said shank back of said recess and serrations extending laterally in opposite directions from the walls of said recess.

JAMES W. IVORY.

Witnesses H. L. OWEN, B. E. ROANTREE. 

